There are only eight codes for Samsung in the case of the 20.0 and 20.1. Once you have the codes, press and hold the "TV" button until all four "Mode" buttons light up, enter the first code and press the pound or # button.
There is no code for the DISH Network remote. The universal remote code for Samsung TVs is 994. The remote controls that come with Samsung TVs don't have the capability to control the DISH DVR.